How can stainless CrNi steel be etched to clearly characterize the individual phases?
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G. Weilnhammer
Gabriele Weilnhammer did a technical apprenticeship as materials tester (physics) from 1970 to 1972 at the SLV Munich. After training as a metallographer from 1972 to 1974 at the Technical College of the Lette Association in Berlin, she worked from 1974 to 1976 as a metallographer at SLV Munich and from 1976 to 1982 at MAN Munich, New Technology. In 1982 she joined SLV again as a metallographer and was head of the metallography laboratory at SLV Munich from 1998 to 2019. She retired in 2019 but still works as a freelancer for the SLV Munich and for the Munich Chamber of Industry and Commerce.
Abstract
In austenitic CrNi steels, in addition to austenite and δ-ferrite, undesirable components such as σ-phase or chromium carbides at grain boundaries can occur during metallographic examination. In order to distinguish these components reliably, it is often necessary to work with different etchants, which are described below [1]. In addition, optimal specimen preparation – manual, mechanical or electrolytic – is essential to obtain an optimal result and a reliable statement under the microscope. Information and suggestions are also given below.
Kurzfassung
Bei austenitischen CrNi-Stählen können bei der metallographischen Untersuchung neben Austenit und δ-Ferrit auch unerwünschte Bestandteile wie z. B. σ-Phase oder Cr-Karbide auf den Korngrenzen auftreten. Um diese Bestandteile sicher voneinander zu unterscheiden, ist es oft erforderlich, mit verschiedenen Ätzmitteln zu arbeiten, die im Folgenden beschrieben werden sollen [1]. Darüber hinaus ist auch eine optimale Schliffpräparation – manuell, automatisch oder elektrolytisch – unabdingbar, um ein optimales Ergebnis und eine sichere Aussage am Mikroskop zu erhalten. Auch dazu sollen im Folgenden Tipps und Anregungen gegeben werden.
About the author
Gabriele Weilnhammer did a technical apprenticeship as materials tester (physics) from 1970 to 1972 at the SLV Munich. After training as a metallographer from 1972 to 1974 at the Technical College of the Lette Association in Berlin, she worked from 1974 to 1976 as a metallographer at SLV Munich and from 1976 to 1982 at MAN Munich, New Technology. In 1982 she joined SLV again as a metallographer and was head of the metallography laboratory at SLV Munich from 1998 to 2019. She retired in 2019 but still works as a freelancer for the SLV Munich and for the Munich Chamber of Industry and Commerce.
Reference / Literatur
[1] Weck, Leistner: Metallographische Anleitung zum Farbätzen nach dem Tauchverfahren. VS Media VerlagSuche in Google Scholar
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Artikel in diesem Heft
- Inhalt
- Editorial
- Editorial
- How can stainless CrNi steel be etched to clearly characterize the individual phases?
- Study on the microstructure and tensile properties of GH5188 high-temperature alloy laser welded joints
- Characterization of an electric resistance welded steel plate
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Artikel in diesem Heft
- Inhalt
- Editorial
- Editorial
- How can stainless CrNi steel be etched to clearly characterize the individual phases?
- Study on the microstructure and tensile properties of GH5188 high-temperature alloy laser welded joints
- Characterization of an electric resistance welded steel plate
- Failure Analysis
- Failure of an impeller blade of a first stage air compressor
- Picture of the Month
- Picture of the Month
- News
- News
- Meeting Diary
- Meeting Diary
